[Help-gnu-radius] default value

[Sergey]

I wanna that all users have default values of some attrib
(Session-Timeout,Simultaneous-use,Idle-Timeout), but some users
(big-bosses :) have another values, now it work.

select * from attrib;

user        attrib              value   op
archy     Simultaneous-Use      1       =
vgray     Simultaneous-Use      1       =
lisa      Simultaneous-Use      1       =
big-boss  Simultaneous-Use      10      =

I want that only non-default values kept in sql database
, how can i do it?